[F:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]=[C:5]([C:11]([OH:13])=O)[NH:6]2.[NH4+].[Cl-].CC[N:18]=C=NCCCN(C)C.C1C=CC2N(O)N=NC=2C=1>CN(C=O)C>[F:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]=[C:5]([C:11]([NH2:18])=[O:13])[NH:6]2
To a solution of 34 (179 mg, 1.00 mmol) in anhydrous DMF (2.0 mL) were added NH4Cl (160 mg, 3.00 mmol), EDCI (395 mg, 2.20 mmol), HOBt (297 mg, 2.20 mmol) and TEA (303 mg, 3.00 mmol) at RT. After stirring at RT for 3 h, the mixture was quenched with H2O (10 mL) the resulting mixture was extracted with EtOAc (3×6 mL). The combined extracts were dried and concentrated. The residue was purified by SiO2 chromatography eluting with petroleum ether/EtOAc (5:1 to 3:1) to afford 130 mg (73%) of 4-fluoro-1H-indole-2-carboxamide (36) as a white solid. LCMS (ESI) m/z: 179.1 [M+H]+.
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